this class can be used to generate PCM data for DTMF tones at a sample rate of 8khz More...

#include <dtmf.h>

Inheritance diagram for PDTMFEncoder:

Public Types
enum	{ DefaultToneLen = 100 }
Public Types inherited from PTones
enum	{ MaxVolume = 100, DefaultSampleRate = 8000, MinFrequency = 30, MinModulation = 5, SineScale = 1000 }

Public Member Functions
	PDTMFEncoder (const char *dtmf=NULL, unsigned milliseconds=DefaultToneLen)
	Create PCM data for the specified DTMF sequence.
	PDTMFEncoder (char key, unsigned milliseconds=DefaultToneLen)
	Create PCM data for the specified dtmf key.
void	AddTone (const char *str, unsigned milliseconds=DefaultToneLen)
	Add the PCM data for the specified tone sequence to the buffer.
void	AddTone (char ch, unsigned milliseconds=DefaultToneLen)
	Add the PCM data for the specified tone to the buffer.
void	AddTone (double frequency1, double frequency2=0, unsigned milliseconds=DefaultToneLen)
	Add the PCM data for the specified dual-frequency tone to the buffer frequency2 can be zero, which will generate a single frequency tone.
void	GenerateRingBackTone ()
	Generate PCM data for a single cadence of the US standard ring tone of 440/480hz for 2 seconds, followed by 5 seconds of silence.
void	GenerateDialTone ()
	Generate PCM data for 1 second of US standard dial tone of 350/440hz.
void	GenerateBusyTone ()
	Generate PCM data for a single cadence of the US standard busy tone of 480/620hz for 1/2 second, 1/2 second of silence.
char	DtmfChar (PINDEX i)
	Convenience function to get the ASCII character for a DTMF index, where the index varies from 0 to 15.
Public Member Functions inherited from PTones
	PTones (unsigned masterVolume=MaxVolume, unsigned sampleRate=DefaultSampleRate)
	Create an empty tone buffer.
	PTones (const PString &descriptor, unsigned masterVolume=MaxVolume, unsigned sampleRate=DefaultSampleRate)
	Create a filled tone buffer using the specified descriptor.
bool	Generate (const PString &descriptor)
	Generate a tone using the specified descriptor.
bool	Generate (char operation, unsigned frequency1, unsigned frequency2, unsigned milliseconds, unsigned volume=MaxVolume)
	Generate a tone using the specified values.
Public Member Functions inherited from PShortArray
	PShortArray (PINDEX initialSize=0)
	Construct a new dynamic array of shorts.
	PShortArray (short const *buffer, PINDEX length, PBoolean dynamic=true)
	Construct a new dynamic array of shorts.
Public Member Functions inherited from PBaseArray< T >
	PBaseArray (PINDEX initialSize=0)
	Construct a new dynamic array of elements of the specified type.
	PBaseArray (T const *buffer, PINDEX length, PBoolean dynamic=true)
	Construct a new dynamic array of elements of the specified type.
virtual PObject *	Clone () const
	Clone the object.
PBoolean	SetAt (PINDEX index, T val)
	Set the specific element in the array.
T	GetAt (PINDEX index) const
	Get a value from the array.
void	Attach (const T *buffer, PINDEX bufferSize)
	Attach a pointer to a static block to the base array type.
T *	GetPointer (PINDEX minSize=0)
	Get a pointer to the internal array and assure that it is of at least the specified size.
T	operator[] (PINDEX index) const
	Get a value from the array.
T &	operator[] (PINDEX index)
	Get a reference to value from the array.
	operator T const * () const
	Get a pointer to the internal array.
PBoolean	Concatenate (const PBaseArray &array)
	Concatenate one array to the end of this array.
Public Member Functions inherited from PAbstractArray
	PAbstractArray (PINDEX elementSizeInBytes, PINDEX initialSize=0)
	Create a new dynamic array of `initalSize` elements of `elementSizeInBytes` bytes each.
	PAbstractArray (PINDEX elementSizeInBytes, const void *buffer, PINDEX bufferSizeInElements, PBoolean dynamicAllocation)
	Create a new dynamic array of `bufferSizeInElements` elements of `elementSizeInBytes` bytes each.
virtual void	PrintOn (ostream &strm) const
	Output the contents of the object to the stream.
virtual void	ReadFrom (istream &strm)
	Input the contents of the object from the stream.
virtual Comparison	Compare (const PObject &obj) const
	Get the relative rank of the two arrays.
virtual PBoolean	SetSize (PINDEX newSize)
	Set the size of the array in elements.
void	Attach (const void *buffer, PINDEX bufferSize)
	Attach a pointer to a static block to the base array type.
PBoolean	Concatenate (const PAbstractArray &array)
	Concatenate one array to the end of this array.
Public Member Functions inherited from PContainer
	PContainer (PINDEX initialSize=0)
	Create a new unique container.
	PContainer (const PContainer &cont)
	Create a new refernce to container.
PContainer &	operator= (const PContainer &cont)
	Assign one container reference to another.
virtual	~PContainer ()
	Destroy the container class.
virtual PINDEX	GetSize () const
	Get the current size of the container.
PBoolean	SetMinSize (PINDEX minSize)
	Set the minimum size of container.
virtual PBoolean	IsEmpty () const
	Determine if the container is empty.
PBoolean	IsUnique () const
	Determine if container is unique reference.
virtual PBoolean	MakeUnique ()
	Make this instance to be the one and only reference to the container contents.
Public Member Functions inherited from PObject
virtual	~PObject ()
virtual PINDEX	HashFunction () const
	This function yields a hash value required by the `PDictionary` class.
virtual Comparison	CompareObjectMemoryDirect (const PObject &obj) const
	Determine the byte wise comparison of two objects.
bool	operator== (const PObject &obj) const
	Compare the two objects.
bool	operator!= (const PObject &obj) const
	Compare the two objects.
bool	operator< (const PObject &obj) const
	Compare the two objects.
bool	operator> (const PObject &obj) const
	Compare the two objects.
bool	operator<= (const PObject &obj) const
	Compare the two objects.
bool	operator>= (const PObject &obj) const
	Compare the two objects.
virtual const char *	GetClass (unsigned ancestor=0) const
	Get the current dynamic type of the object instance.
PBoolean	IsClass (const char *cls) const
virtual PBoolean	InternalIsDescendant (const char *clsName) const
	Determine if the dynamic type of the current instance is a descendent of the specified class.

Additional Inherited Members
Static Public Member Functions inherited from PObject
static Comparison	InternalCompareObjectMemoryDirect (const PObject obj1, const PObject obj2, PINDEX size)
	Internal function caled from CompareObjectMemoryDirect()
static const char *	Class ()
	Get the name of the class as a C string.
Protected Member Functions inherited from PTones
void	Construct ()
bool	Juxtapose (unsigned frequency1, unsigned frequency2, unsigned milliseconds, unsigned volume)
bool	Modulate (unsigned frequency, unsigned modulate, unsigned milliseconds, unsigned volume)
bool	PureTone (unsigned frequency, unsigned milliseconds, unsigned volume)
bool	Silence (unsigned milliseconds)
unsigned	CalcSamples (unsigned milliseconds, unsigned frequency1, unsigned frequency2=0)
void	AddSample (int sample, unsigned volume)
Protected Attributes inherited from PTones
unsigned	m_sampleRate
unsigned	m_maxFrequency
unsigned	m_masterVolume
char	m_lastOperation
unsigned	m_lastFrequency1
unsigned	m_lastFrequency2
int	m_angle1
int	m_angle2
Friends inherited from PObject

Detailed Description

this class can be used to generate PCM data for DTMF tones at a sample rate of 8khz

Member Enumeration Documentation

anonymous enum

Enumerator:

DefaultToneLen

Constructor & Destructor Documentation

PDTMFEncoder::PDTMFEncoder	(	const char *	dtmf = `NULL`,
		unsigned	milliseconds = `DefaultToneLen`
	)

Create PCM data for the specified DTMF sequence.

Parameters

dtmf	character string to encode
milliseconds	length of each DTMF tone in milliseconds

PDTMFEncoder::PDTMFEncoder	(	char	key,
		unsigned	milliseconds = `DefaultToneLen`
	)

Create PCM data for the specified dtmf key.

Parameters

key	character string to encode
milliseconds	length of each DTMF tone in milliseconds

Member Function Documentation

void PDTMFEncoder::AddTone	(	const char *	str,
		unsigned	milliseconds = `DefaultToneLen`
	)

Add the PCM data for the specified tone sequence to the buffer.

Parameters

str	string to encode
milliseconds	length of DTMF tone in milliseconds

void PDTMFEncoder::AddTone	(	char	ch,
		unsigned	milliseconds = `DefaultToneLen`
	)

Add the PCM data for the specified tone to the buffer.

Parameters

ch	character to encode
milliseconds	length of DTMF tone in milliseconds

void PDTMFEncoder::AddTone	(	double	frequency1,
		double	frequency2 = `0`,
		unsigned	milliseconds = `DefaultToneLen`
	)

Add the PCM data for the specified dual-frequency tone to the buffer frequency2 can be zero, which will generate a single frequency tone.

char PDTMFEncoder::DtmfChar ( PINDEX i )

Convenience function to get the ASCII character for a DTMF index, where the index varies from 0 to 15.

Returns: ASCII value

Parameters

i	index of tone

void PDTMFEncoder::GenerateBusyTone ( )

inline

Generate PCM data for a single cadence of the US standard busy tone of 480/620hz for 1/2 second, 1/2 second of silence.

References PTones::Generate().

void PDTMFEncoder::GenerateDialTone ( )

inline

Generate PCM data for 1 second of US standard dial tone of 350/440hz.

References PTones::Generate().

void PDTMFEncoder::GenerateRingBackTone ( )

inline

Generate PCM data for a single cadence of the US standard ring tone of 440/480hz for 2 seconds, followed by 5 seconds of silence.

References PTones::Generate().

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

dtmf.h

Public Types

Public Member Functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation