ost::AudioTone Class Reference

The AudioTone class is used to create a frame of audio encoded single or dualtones. More...

#include <audio2.h>

Inheritance diagram for ost::AudioTone:

List of all members.

Public Member Functions
Rate	getRate (void)
	Get the sample encoding rate being used for the tone generator.
size_t	getSamples (void)
	Get the frame size for the number of audio samples generated.
bool	isSilent (void)
	Test if the tone generator is currently set to silence.
virtual Linear	getFrame (void)
	Iterate the tone frame, and extract linear samples in native frame.
unsigned	getFrames (Linear buffer, unsigned number)
	This is used to copy one or more pages of framed audio quickly to an external buffer.
virtual bool	isComplete (void)
	See if at end of tone.
	AudioTone (timeout_t duration=20, Rate rate=rate8khz)
	Construct a silent tone generator of specific frame size.
	AudioTone (unsigned f1, unsigned f2, Level l1, Level l2, timeout_t duration=20, Rate sample=rate8khz)
	Construct a dual tone frame generator.
	AudioTone (unsigned freq, Level level, timeout_t duration=20, Rate sample=rate8khz)
	Construct a single tone frame generator.
virtual	~AudioTone ()
Protected Member Functions
void	silence (void)
	Set the frame to silent.
void	reset (void)
	Reset the tone generator completely.
void	cleanup (void)
	Cleanup for virtual destructors to use.
void	single (unsigned freq, Level level)
	Set frame to generate single tone.
void	dual (unsigned f1, unsigned f2, Level l1, Level l2)
	Set frame to generate dual tone.
Protected Attributes
Rate	rate
unsigned	samples
Linear	frame
double	df1
double	df2
double	p1
double	p2
Level	m1
Level	m2
bool	silencer

---

Detailed Description

The AudioTone class is used to create a frame of audio encoded single or dualtones.

The frame will be iterated for each request, so a continual tone can be extracted by frame.

Author:

David Sugar <dyfet@ostel.com> audio tone generator class.

---

Constructor & Destructor Documentation

ost::AudioTone::AudioTone	(	timeout_t	duration = 20,
		Rate	rate = rate8khz
	)

Construct a silent tone generator of specific frame size.

Parameters:

	duration	of frame in milliseconds.
	rate	of samples.

ost::AudioTone::AudioTone	(	unsigned	f1,
		unsigned	f2,
		Level	l1,
		Level	l2,
		timeout_t	duration = 20,
		Rate	sample = rate8khz
	)

Construct a dual tone frame generator.

Parameters:

	f1	frequency of tone 1.
	f2	frequency of tone 2.
	l1	level of tone 1.
	l2	level of tone 2.
	duration	of frame in milliseconds.
	sample	rate being generated.

ost::AudioTone::AudioTone	(	unsigned	freq,
		Level	level,
		timeout_t	duration = 20,
		Rate	sample = rate8khz
	)

Construct a single tone frame generator.

Parameters:

	freq	of tone.
	level	of tone.
	duration	of frame in milliseconds.
	sample	rate being generated.

virtual ost::AudioTone::~AudioTone

(

)

[virtual]

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Member Function Documentation

void ost::AudioTone::silence

(

void

)

[protected]

Set the frame to silent.

void ost::AudioTone::reset

(

void

)

[protected]

Reset the tone generator completely.

Produces silence.,

void ost::AudioTone::cleanup

(

void

)

[protected]

Cleanup for virtual destructors to use.

void ost::AudioTone::single	(	unsigned	freq,
		Level	level
	)			[protected]

Set frame to generate single tone.

..

Parameters:

	freq	of tone.
	level	of tone.

void ost::AudioTone::dual	(	unsigned	f1,
		unsigned	f2,
		Level	l1,
		Level	l2
	)			[protected]

Set frame to generate dual tone.

..

Parameters:

	f1	frequency of tone 1
	f2	frequency of tone 2
	l1	level of tone 1
	l2	level of tone 2

Rate ost::AudioTone::getRate

(

void

)

[inline]

Get the sample encoding rate being used for the tone generator.

Returns:

sample rate in samples per second.

size_t ost::AudioTone::getSamples

(

void

)

[inline]

Get the frame size for the number of audio samples generated.

Returns:

number of samples processed in frame.

bool ost::AudioTone::isSilent

(

void

)

Test if the tone generator is currently set to silence.

Returns:

true if generator set for silence.

virtual Linear ost::AudioTone::getFrame

(

void

)

[virtual]

Iterate the tone frame, and extract linear samples in native frame.

If endian flag passed, then convert for standard endian representation (byte swap) if needed.

Returns:

pointer to samples.

Reimplemented in ost::TelTone, ost::DTMFTones, and ost::MFTones.

unsigned ost::AudioTone::getFrames	(	Linear	buffer,
		unsigned	number
	)

This is used to copy one or more pages of framed audio quickly to an external buffer.

Returns:

number of frames copied.

Parameters:

	buffer	to copy into.
	number	of frames requested.

virtual bool ost::AudioTone::isComplete

(

void

)

[virtual]

See if at end of tone.

This is used for non-continues audio tones, or to detect "break" events.

Returns:

true if end of data.

Reimplemented in ost::TelTone, ost::DTMFTones, and ost::MFTones.

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Member Data Documentation

Rate ost::AudioTone::rate [protected]

unsigned ost::AudioTone::samples [protected]

Linear ost::AudioTone::frame [protected]

double ost::AudioTone::df1 [protected]

double ost::AudioTone::df2 [protected]

double ost::AudioTone::p1 [protected]

double ost::AudioTone::p2 [protected]

Level ost::AudioTone::m1 [protected]

Level ost::AudioTone::m2 [protected]

bool ost::AudioTone::silencer [protected]

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

• audio2.h