ima_adpcm.c File Reference

#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include "spandsp/telephony.h"
#include "spandsp/dc_restore.h"
#include "spandsp/ima_adpcm.h"

Functions
ima_adpcm_state_t *	ima_adpcm_init (ima_adpcm_state_t *s, int variant)
int	ima_adpcm_release (ima_adpcm_state_t *s)
int	ima_adpcm_decode (ima_adpcm_state_t *s, int16_t amp[], const uint8_t ima_data[], int ima_bytes)
int	ima_adpcm_encode (ima_adpcm_state_t *s, uint8_t ima_data[], const int16_t amp[], int len)

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Detailed Description

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Function Documentation

int ima_adpcm_decode	(	ima_adpcm_state_t *	s,
		int16_t	amp[],
		const uint8_t	ima_data[],
		int	ima_bytes
	)

Decode a buffer of IMA ADPCM data to linear PCM.

Parameters:

	s	The IMA ADPCM context.
	amp	The audio sample buffer.
	ima_data
	ima_bytes

Returns:

The number of samples returned.

int ima_adpcm_encode	(	ima_adpcm_state_t *	s,
		uint8_t	ima_data[],
		const int16_t	amp[],
		int	len
	)

Encode a buffer of linear PCM data to IMA ADPCM.

Parameters:

	s	The IMA ADPCM context.
	ima_data	The IMA ADPCM data produced.
	amp	The audio sample buffer.
	len	The number of samples in the buffer.

Returns:

The number of bytes of IMA ADPCM data produced.

ima_adpcm_state_t* ima_adpcm_init	(	ima_adpcm_state_t *	s,
		int	variant
	)

Initialise an IMA ADPCM encode or decode context.

Parameters:

	s	The IMA ADPCM context
	variant	???

Returns:

A pointer to the IMA ADPCM context, or NULL for error.

int ima_adpcm_release

(

ima_adpcm_state_t *

s

)

Free an IMA ADPCM encode or decode context.

Parameters:

s

The IMA ADPCM context.

Returns:

0 for OK.

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