spandsp 0.0.6
g722.h File Reference

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Typedefs

typedef struct g722_encode_state_s g722_encode_state_t
typedef struct g722_decode_state_s g722_decode_state_t

Enumerations

enum  { G722_SAMPLE_RATE_8000 = 0x0001 , G722_PACKED = 0x0002 }

Functions

g722_encode_state_tg722_encode_init (g722_encode_state_t *s, int rate, int options)
int g722_encode_release (g722_encode_state_t *s)
int g722_encode_free (g722_encode_state_t *s)
int g722_encode (g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len)
g722_decode_state_tg722_decode_init (g722_decode_state_t *s, int rate, int options)
int g722_decode_release (g722_decode_state_t *s)
int g722_decode_free (g722_decode_state_t *s)
int g722_decode (g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len)

Typedef Documentation

◆ g722_decode_state_t

G.722 decode state

◆ g722_encode_state_t

G.722 encode state

Function Documentation

◆ g722_decode()

int g722_decode ( g722_decode_state_t * s,
int16_t amp[],
const uint8_t g722_data[],
int len )

Decode a buffer of G.722 data to linear PCM.

Parameters
sThe G.722 context.
ampThe audio sample buffer.
g722_data
len
Returns
The number of samples returned.

References g722_decode_state_s::bits_per_sample, g722_decode_state_s::eight_k, g722_decode_state_s::itu_test_mode, g722_decode_state_s::packed, and g722_decode_state_s::x.

◆ g722_decode_free()

int g722_decode_free ( g722_decode_state_t * s)

Free a G.722 decode context.

Parameters
sThe G.722 decode context.
Returns
0 for OK.

◆ g722_decode_init()

g722_decode_state_t * g722_decode_init ( g722_decode_state_t * s,
int rate,
int options )

Initialise an G.722 decode context.

Parameters
sThe G.722 decode context.
rateThe bit rate of the G.722 data. The valid rates are 64000, 56000 and 48000.
options
Returns
A pointer to the G.722 decode context, or NULL for error.

References g722_decode_state_s::bits_per_sample, g722_decode_state_s::eight_k, and g722_decode_state_s::packed.

◆ g722_decode_release()

int g722_decode_release ( g722_decode_state_t * s)

Release a G.722 decode context.

Parameters
sThe G.722 decode context.
Returns
0 for OK.

◆ g722_encode()

int g722_encode ( g722_encode_state_t * s,
uint8_t g722_data[],
const int16_t amp[],
int len )

Encode a buffer of linear PCM data to G.722

Parameters
sThe G.722 context.
g722_dataThe G.722 data produced.
ampThe audio sample buffer.
lenThe number of samples in the buffer.
Returns
The number of bytes of G.722 data produced.

References g722_encode_state_s::bits_per_sample, g722_encode_state_s::eight_k, g722_encode_state_s::itu_test_mode, g722_encode_state_s::packed, and g722_encode_state_s::x.

◆ g722_encode_free()

int g722_encode_free ( g722_encode_state_t * s)

Free a G.722 encode context.

Parameters
sThe G.722 encode context.
Returns
0 for OK.

◆ g722_encode_init()

g722_encode_state_t * g722_encode_init ( g722_encode_state_t * s,
int rate,
int options )

Initialise an G.722 encode context.

Parameters
sThe G.722 encode context.
rateThe required bit rate for the G.722 data. The valid rates are 64000, 56000 and 48000.
options
Returns
A pointer to the G.722 encode context, or NULL for error.

References g722_encode_state_s::bits_per_sample, g722_encode_state_s::eight_k, and g722_encode_state_s::packed.

◆ g722_encode_release()

int g722_encode_release ( g722_encode_state_t * s)

Release a G.722 encode context.

Parameters
sThe G.722 encode context.
Returns
0 for OK.