SYNOPSIS

#include <audio2.h>

Inherits ost::Audio.

Inherited by ost::DTMFTones, ost::MFTones, and ost::TelTone.

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 <[email protected]> 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]

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.

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]

Author

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