src/spandsp/g711.h File Reference

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Classes
struct	g711_state_t
Defines
#define	_SPANDSP_G711_H_
#define	G711_ALAW_IDLE_OCTET   0x5D
#define	G711_ULAW_IDLE_OCTET   0xFF
#define	ULAW_BIAS   0x84
#define	ALAW_AMI_MASK   0x55
Enumerations
enum	{ G711_ALAW = 0, G711_ULAW }
Functions
uint8_t	alaw_to_ulaw (uint8_t alaw)
	Transcode from A-law to u-law, using the procedure defined in G.711.
uint8_t	ulaw_to_alaw (uint8_t ulaw)
	Transcode from u-law to A-law, using the procedure defined in G.711.
int	g711_decode (g711_state_t *s, int16_t amp[], const uint8_t g711_data[], int g711_bytes)
int	g711_encode (g711_state_t *s, uint8_t g711_data[], const int16_t amp[], int len)
int	g711_transcode (g711_state_t *s, uint8_t g711_out[], const uint8_t g711_in[], int g711_bytes)
g711_state_t *	g711_init (g711_state_t *s, int mode)
int	g711_release (g711_state_t *s)

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Detailed Description

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Function Documentation

uint8_t alaw_to_ulaw

(

uint8_t

alaw

)

Transcode from A-law to u-law, using the procedure defined in G.711.

Parameters:

alaw

The A-law sample to transcode.

Returns:

The best matching u-law value.

g711_state_t* g711_init	(	g711_state_t *	s,
		int	mode
	)

Initialise a G.711 encode or decode context.

Parameters:

	s	The G.711 context.
	mode	The G.711 mode.

Returns:

A pointer to the G.711 context, or NULL for error.

int g711_release

(

g711_state_t *

s

)

Free a G.711 encode or decode context.

Parameters:

s

The G.711 context.

Returns:

0 for OK.

uint8_t ulaw_to_alaw

(

uint8_t

ulaw

)

Transcode from u-law to A-law, using the procedure defined in G.711.

Parameters:

ulaw

The u-law sample to transcode.

Returns:

The best matching A-law value.

Parameters:

alaw

The u-law sample to transcode.

Returns:

The best matching A-law value.