g726.h File Reference

Go to the source code of this file.

Classes
struct	g726_state_s
Defines
#define	_G726_H_
#define	G726_ENCODING_LINEAR   0
#define	G726_ENCODING_ULAW   1
#define	G726_ENCODING_ALAW   2
Typedefs
typedef int16_t(*)	g726_decoder_func_t (struct g726_state_s *s, uint8_t code)
typedef uint8_t(*)	g726_encoder_func_t (struct g726_state_s *s, int16_t amp)
typedef g726_state_s	g726_state_t
Functions
g726_state_t *	g726_init (g726_state_t *s, int bit_rate, int ext_coding, int packed)
int	g726_release (g726_state_t *s)
int	g726_decode (g726_state_t *s, int16_t amp[], const uint8_t g726_data[], int g726_bytes)
int	g726_encode (g726_state_t *s, uint8_t g726_data[], const int16_t amp[], int samples)

---

Detailed Description

---

Function Documentation

int g726_decode	(	g726_state_t *	s,
		int16_t	amp[],
		const uint8_t	g726_data[],
		int	g726_bytes
	)

Decode a buffer of G.726 ADPCM data to linear PCM, a-law or u-law.

Parameters:

	s	The G.726 context.
	amp
	g726_data
	g726_bytes

Returns:

The number of samples returned.

int g726_encode	(	g726_state_t *	s,
		uint8_t	g726_data[],
		const int16_t	amp[],
		int	samples
	)

Encode a buffer of linear PCM data to G.726 ADPCM.

Parameters:

	s	The G.726 context.
	g726_data
	amp
	samples

Returns:

The number of bytes of G.726 data produced.

g726_state_t* g726_init	(	g726_state_t *	s,
		int	bit_rate,
		int	ext_coding,
		int	packed
	)

Initialise a G.726 encode or decode context.

Parameters:

	s	The G.726 context.
	bit_rate	The required bit rate for the ADPCM data. The valid rates are 16000, 24000, 32000 and 40000.
	ext_coding	The coding used outside G.726.
	packed	TRUE to use packed G.726. Otherwise G.726 will be expected as one code per octet.

Returns:

A pointer to the G.726 context, or NULL for error.

int g726_release

(

g726_state_t *

s

)

Free a G.726 encode or decode context.

Parameters:

s

The G.726 context.

Returns:

0 for OK.

---