PDTMFEncoder Class Reference

#include <dtmf.h>

Inheritance diagram for PDTMFEncoder:

List of all members.

Public Types
enum	{ DefaultToneLen = 100 }
Public Member Functions
	PDTMFEncoder (const char *dtmf=NULL, unsigned milliseconds=DefaultToneLen)
	PDTMFEncoder (char key, unsigned milliseconds=DefaultToneLen)
void	AddTone (const char *str, unsigned milliseconds=DefaultToneLen)
void	AddTone (char ch, unsigned milliseconds=DefaultToneLen)
void	AddTone (double frequency1, double frequency2=0, unsigned milliseconds=DefaultToneLen)
void	GenerateRingBackTone ()
void	GenerateDialTone ()
void	GenerateBusyTone ()
char	DtmfChar (PINDEX i)

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Detailed Description

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

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Member Enumeration Documentation

anonymous enum

Enumerator:

DefaultToneLen

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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

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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

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

void PDTMFEncoder::GenerateDialTone

(

)

[inline]

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

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

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

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

• dtmf.h

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