oki_adpcm.h File Reference

Go to the source code of this file.

Typedefs

typedef struct oki_adpcm_state_s oki_adpcm_state_t

Functions

oki_adpcm_state_toki_adpcm_init (oki_adpcm_state_t *s, int bit_rate)
int oki_adpcm_release (oki_adpcm_state_t *s)
int oki_adpcm_free (oki_adpcm_state_t *s)
int oki_adpcm_decode (oki_adpcm_state_t *s, int16_t amp[], const uint8_t oki_data[], int oki_bytes)
int oki_adpcm_encode (oki_adpcm_state_t *s, uint8_t oki_data[], const int16_t amp[], int len)


Detailed Description


Typedef Documentation

Oki (Dialogic) ADPCM conversion state descriptor. This defines the state of a single working instance of the Oki ADPCM converter. This is used for either linear to ADPCM or ADPCM to linear conversion.


Function Documentation

int oki_adpcm_decode ( oki_adpcm_state_t s,
int16_t  amp[],
const uint8_t  oki_data[],
int  oki_bytes 
)

Decode a buffer of Oki ADPCM data to linear PCM.

Parameters:
s The Oki ADPCM context.
amp The audio sample buffer.
oki_data 
oki_bytes 
Returns:
The number of samples returned.

int oki_adpcm_encode ( oki_adpcm_state_t s,
uint8_t  oki_data[],
const int16_t  amp[],
int  len 
)

Encode a buffer of linear PCM data to Oki ADPCM.

Parameters:
s The Oki ADPCM context.
oki_data The Oki ADPCM data produced
amp The audio sample buffer.
len The number of samples in the buffer.
Returns:
The number of bytes of Oki ADPCM data produced.

int oki_adpcm_free ( oki_adpcm_state_t s  ) 

Free an Oki ADPCM encode or decode context.

Parameters:
s The Oki ADPCM context.
Returns:
0 for OK.

oki_adpcm_state_t* oki_adpcm_init ( oki_adpcm_state_t s,
int  bit_rate 
)

Initialise an Oki ADPCM encode or decode context.

Parameters:
s The Oki ADPCM context.
bit_rate The required bit rate for the ADPCM data. The valid rates are 24000 and 32000.
Returns:
A pointer to the Oki ADPCM context, or NULL for error.

int oki_adpcm_release ( oki_adpcm_state_t s  ) 

Release an Oki ADPCM encode or decode context.

Parameters:
s The Oki ADPCM context.
Returns:
0 for OK.


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