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 len=DefaultToneLen)
void	AddTone (char ch, unsigned len=DefaultToneLen)
void	AddTone (const PString &str, unsigned len=DefaultToneLen)
void	AddTone (double freq1, double freq2=0, unsigned len=DefaultToneLen)
void	GenerateRingBackTone ()
void	GenerateDialTone ()
void	GenerateBusyTone ()
char	DtmfChar (PINDEX i)
Static Protected Member Functions
static PMutex &	GetMutex ()
static void	MakeSineTable ()
static double	sine (unsigned int ptr)
Static Protected Attributes
static BOOL	sineTabInit
static double	sinetab [1<< 11]

---

Detailed Description

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

---

Member Enumeration Documentation

anonymous enum

Enumeration values: DefaultToneLen

---

Constructor & Destructor Documentation

PDTMFEncoder::PDTMFEncoder (  const char *  dtmf = NULL, unsigned  len = DefaultToneLen )  [inline]

Create PCM data for the specified DTMF sequence Parameters: dtmf  character string to encode len  length of each DTMF tone in milliseconds

---

Member Function Documentation

void PDTMFEncoder::AddTone (  double  freq1, double  freq2 = 0, unsigned  len = DefaultToneLen )

Add the PCM data for the specified dual-frequency tone to the buffer freq2 can be zero, which will generate a single frequency tone

void PDTMFEncoder::AddTone (  const PString &  str, unsigned  len = DefaultToneLen )

Add the PCM data for the specified tone sequence to the buffer Parameters: str  string to encode len  length of DTMF tone in milliseconds

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

Add the PCM data for the specified tone to the buffer Parameters: ch  character to encode len  length of DTMF tone in milliseconds

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

void PDTMFEncoder::GenerateDialTone (   )  [inline]

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

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

static PMutex& PDTMFEncoder::GetMutex (   )  [static, protected]

static void PDTMFEncoder::MakeSineTable (   )  [static, protected]

static double PDTMFEncoder::sine (  unsigned int  ptr  )  [inline, static, protected]

---

Member Data Documentation

double PDTMFEncoder::sinetab[1<< 11] [static, protected]

BOOL PDTMFEncoder::sineTabInit [static, protected]

---

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

• dtmf.h

---