Plays audio from a pre-rendered AudioBuffer. More...

#include <hart_audio_buffer_signal.hpp>

Inheritance diagram for AudioBufferSignal< SampleType >:

Public Types
enum class	Loop { yes , no }

Public Member Functions
	AudioBufferSignal (std::shared_ptr< AudioBuffer< SampleType > > buffer, Loop loop=Loop::no)
	Construct from a shared_ptr (shared ownership)

	AudioBufferSignal (const AudioBuffer< SampleType > &buffer, Loop loop=Loop::no)
	Construct by copying a buffer (takes ownership of a copy)

	AudioBufferSignal (AudioBuffer< SampleType > &&buffer, Loop loop=Loop::no)
	Construct by moving a buffer (takes ownership)

bool	supportsNumChannels (size_t numChannels) const override
	Tells the host whether this Signal is capable of generating audio for a certain amount of channels.

bool	supportsSampleRate (double sampleRateHz) const override
	Tells whether this Signal supports given sample rate.

void	prepare (double sampleRateHz, size_t numOutputChannels, size_t) override
	Prepare the signal for rendering.

void	renderNextBlock (AudioBuffer< SampleType > &output) override
	Renders next block audio for the signal.

void	reset () override
	Resets the Signal to initial state.

void	represent (std::ostream &stream) const override
	Makes a text representation of this Signal for test failure outputs.

std::unique_ptr< SignalBase< SampleType > >	copy () const override
	Returns a smart pointer with a copy of this object.

std::unique_ptr< SignalBase< SampleType > >	move () override
	Returns a smart pointer with a moved instance of this object.

Public Member Functions inherited from Signal< SampleType, AudioBufferSignal< SampleType > >
AudioBufferSignal< SampleType > &	followedBy (DerivedDSP &&dsp) &
	Adds a DSP effect to the end of signal's DSP chain.

AudioBufferSignal< SampleType > &&	followedBy (DerivedDSP &&dsp) &&
	Adds a DSP effect to the end of signal's DSP chain.

AudioBufferSignal< SampleType > &	followedBy (std::unique_ptr< DSPBase< SampleType > > dsp) &
	Adds a DSP effect to the end of signal's DSP chain.

AudioBufferSignal< SampleType > &&	followedBy (std::unique_ptr< DSPBase< SampleType > > dsp) &&
	Adds a DSP effect to the end of signal's DSP chain.

std::unique_ptr< SignalBase< SampleType > >	copy () const override
	Returns a smart pointer with a copy of this object.

std::unique_ptr< SignalBase< SampleType > >	move () override
	Returns a smart pointer with a moved instance of this object.

AudioBufferSignal< SampleType > &	skipTo (double startTimestampSeconds) &
	Skips the signal to a specific timestamp.

AudioBufferSignal< SampleType > &&	skipTo (double startTimestampSeconds) &&
	Skips the signal to a specific timestamp.

AudioBufferSignal< SampleType >	operator- () const
	Returns a copy of this signal, but with flipped phase.

AudioBufferSignal< SampleType >	operator~ () const
	Returns a copy of this signal, but with flipped phase.

Public Member Functions inherited from SignalBase< SampleType >
	SignalBase ()=default
	Default constructor.

	SignalBase (const SignalBase &other)
	Copies other signal.

	SignalBase (SignalBase &&other) noexcept
	Moves from other signal.

virtual	~SignalBase ()=default
	Destructor.

SignalBase &	operator= (const SignalBase &other)
	Copies from other signal.

SignalBase &	operator= (SignalBase &&other) noexcept
	Moves from other signal.

void	prepareWithDSPChain (double sampleRateHz, size_t numOutputChannels, size_t maxBlockSizeFrames)
	Prepares the signal and all attached effects in the DSP chain for rendering.

void	renderNextBlockWithDSPChain (AudioBuffer< SampleType > &output)
	Renders next block audio for the signal and all the effects in the DSP chain.

virtual void	resetWithDSPChain ()
	Resets to Signal and all the effects attached to its DSP chain to initial state.

size_t	getDSPChainSize () const
	Returns the size of the DSP chain attached to the Signal.

DSPBase< SampleType > *	getDSP (int index=-1) const
	Access a specific element in the DSP chain.

std::unique_ptr< DSPBase< SampleType > >	popDSP (int index=-1)
	Extract a specific element in the DSP chain by removing it.

Additional Inherited Members
Protected Member Functions inherited from SignalBase< SampleType >
void	setNumChannels (size_t numChannels)

size_t	getNumChannels ()

Protected Attributes inherited from SignalBase< SampleType >
size_t	m_numChannels = 1

double	m_startTimestampSeconds = 0.0

std::vector< std::unique_ptr< DSPBase< SampleType > > >	m_dspChain

Related Symbols inherited from Signal< SampleType, AudioBufferSignal< SampleType > >
MixedSignal< SampleType >	operator- (const Signal< SampleType, DerivedSignalTypeLHS > &lhs, const Signal< SampleType, DerivedSignalTypeRHS > &rhs)
	Subtracts one signal from another, resulting in a new mixed signal.

MixedSignal< SampleType >	operator+ (const Signal< SampleType, DerivedSignalTypeLHS > &lhs, const Signal< SampleType, DerivedSignalTypeRHS > &rhs)
	Adds one signal to another, resulting in a new mixed signal.

std::ostream &	operator<< (std::ostream &stream, const SignalBase< SampleType > &signal)
	Prints readable text representation of the Signal object into the I/O stream.

auto	operator>> (AudioBufferSignal< SampleType > &signal, DerivedDSP &&dsp) -> decltype(signal.followedBy(std::forward< DerivedDSP >(dsp)))
	Adds a DSP effect to the end of signal's DSP chain by transfering it.

auto	operator>> (AudioBufferSignal< SampleType > &&signal, DerivedDSP &&dsp) -> decltype(std::move(signal).followedBy(std::forward< DerivedDSP >(dsp)))
	Adds a DSP effect to the end of signal's DSP chain by transfering it.

Detailed Description

template<typename SampleType>
class hart::AudioBufferSignal< SampleType >

Plays audio from a pre-rendered AudioBuffer.

Definition at line 15 of file hart_audio_buffer_signal.hpp.

Member Enumeration Documentation

◆ Loop

template<typename SampleType >

enum class Loop

strong

Enumerator
yes
no

Definition at line 19 of file hart_audio_buffer_signal.hpp.

Constructor & Destructor Documentation

◆ AudioBufferSignal() [1/3]

template<typename SampleType >

AudioBufferSignal	(	std::shared_ptr< AudioBuffer< SampleType > >	buffer,
		Loop	loop = `Loop::no`
	)

inlineexplicit

Construct from a shared_ptr (shared ownership)

Definition at line 26 of file hart_audio_buffer_signal.hpp.

◆ AudioBufferSignal() [2/3]

template<typename SampleType >

AudioBufferSignal	(	const AudioBuffer< SampleType > &	buffer,
		Loop	loop = `Loop::no`
	)

inlineexplicit

Construct by copying a buffer (takes ownership of a copy)

Definition at line 37 of file hart_audio_buffer_signal.hpp.

◆ AudioBufferSignal() [3/3]

template<typename SampleType >

AudioBufferSignal	(	AudioBuffer< SampleType > &&	buffer,
		Loop	loop = `Loop::no`
	)

inlineexplicit

Construct by moving a buffer (takes ownership)

Definition at line 45 of file hart_audio_buffer_signal.hpp.

Member Function Documentation

◆ supportsNumChannels()

template<typename SampleType >

bool supportsNumChannels ( size_t ) const

inlineoverridevirtual

Tells the host whether this Signal is capable of generating audio for a certain amount of channels.

It is guaranteed that the signal will not receive unsupported number of channels in renderNextBlock(). This method is guaranteed to be called at least once before prepare()

Note: This method should only care about the Signal itself, and not the attached effects in DSP chain - they'll be queried separately

Parameters

numChannels Number of output channels that will need to be filled

Returns: true if signal is capable of filling this many channels with audio, false otherwise

Reimplemented from SignalBase< SampleType >.

Definition at line 52 of file hart_audio_buffer_signal.hpp.

◆ supportsSampleRate()

template<typename SampleType >

bool supportsSampleRate ( double ) const

inlineoverridevirtual

Tells whether this Signal supports given sample rate.

It is guaranteed to be called before prepare()

Note: This method should only care about the Signal itself, and not the attached effects in DSP chain - they'll be queried separately

Parameters

sampleRateHz sample rate at which the audio should be generated

Returns: true if signal is capable of generating audio at a given sample rate, false otherwise

Reimplemented from SignalBase< SampleType >.

Definition at line 57 of file hart_audio_buffer_signal.hpp.

◆ prepare()

template<typename SampleType >

void prepare	(	double	sampleRateHz,
		size_t	numOutputChannels,
		size_t	maxBlockSizeFrames
	)

inlineoverridevirtual

Prepare the signal for rendering.

This method is guaranteed to be called after supportsNumChannels() and supportsSampleRate(), but before renderNextBlock(). It is guaranteed that numChannels obeys supportsNumChannels() preferences, same with sampleRateHz and supportsSampleRate(). It is guaranteed that all subsequent renderNextBlock() calls will be in line with the arguments received in this callback.

Parameters

sampleRateHz	sample rate at which the audio should be generated
numOutputChannels	Number of output channels to be filled
maxBlockSizeFrames	Maximum block size in frames (samples)

Implements SignalBase< SampleType >.

Definition at line 66 of file hart_audio_buffer_signal.hpp.

◆ renderNextBlock()

template<typename SampleType >

void renderNextBlock ( AudioBuffer< SampleType > & output )

inlineoverridevirtual

Renders next block audio for the signal.

Depending on circumstances, this callback will either be called once to generate an entire piece of audio from start to finish, or called repeatedly, one block at a time. This method is guaranteed to be called strictly after prepare(), or not called at all. Number of channels and max block size are guaranteed to be in line with the ones set by prepare() callback. Assume sample rate to always be equal to the one received in the last prepare() callback. All audio blocks except the last one are guaranteed to be equal to maxBlockSizeFrames set in prepare() callback.

Warning: Remember that the very last block of audio is almost always smaller than the block size set in prepare(), so be careful with buffer bounds.

Note: Note that this method does not have to be real-time safe, as all rendering always happens offline. Also note that, unlike real-time audio applications, this method is called on the same thread as all others like prepare().

Parameters

output Output audio block

Warning: Output audio buffer is not guaranteed to be pre-filled with zeros, it may contain junk data.

Implements SignalBase< SampleType >.

Definition at line 78 of file hart_audio_buffer_signal.hpp.

◆ reset()

template<typename SampleType >

void reset ( )

inlineoverridevirtual

Resets the Signal to initial state.

Ideally should be implemented in a way that audio produced after resetting is identical to audio produced after instantiation

Implements SignalBase< SampleType >.

Definition at line 122 of file hart_audio_buffer_signal.hpp.

◆ represent()

template<typename SampleType >

void represent ( std::ostream & stream ) const

inlineoverridevirtual

Makes a text representation of this Signal for test failure outputs.

It is strongly encouraged to follow python's repr() conventions for returned text - basically, put something like "MyClass(value1, value2)" (with no quotes) into the stream whenever possible, or "<Readable info in angled brackets>" otherwise. Also, use built-in stream manipulators like dbPrecision wherever applicable. Use HART_DEFINE_GENERIC_REPRESENT() to get a basic implementation for this method.

Parameters

[out] stream Output stream to write to

Implements SignalBase< SampleType >.

Definition at line 127 of file hart_audio_buffer_signal.hpp.