Codec1.h File Reference

Detailed Description

Implementation of TI Codec Type 1 (IMA ADPCM) encoding and decoding.

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This module provides functions for encoding and decoding data using ADPCM encoding.

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#include <stdint.h>

Go to the source code of this file.

Functions
uint8_t	Codec1_encodeSingle (int16_t audSample)
	This routine encodes one int16 sample with TI Codec Type 1. More...
int16_t	Codec1_decodeSingle (uint8_t nibble_4bits)
	This routine decode a 4-bit nibble sample to a uint16 PCM audio sample. More...
uint8_t	Codec1_encodeBuff (uint8_t *dst, int16_t *src, int16_t srcSize, int8_t *si, int16_t *pv)
	This routine encode a buffer with TI codec Type 1. More...
void	Codec1_decodeBuff (int16_t *dst, uint8_t *src, unsigned srcSize, int8_t *si, int16_t *pv)
	This routine decodes a buffer with TI codec Type 1. More...

Function Documentation

Codec1_encodeSingle()

uint8_t Codec1_encodeSingle

(

int16_t

audSample

)

This routine encodes one int16 sample with TI Codec Type 1.

Parameters

audSample

The audtion sample to encode

Returns

The encoded result as a 4-bit nibble

Codec1_decodeSingle()

int16_t Codec1_decodeSingle

(

uint8_t

nibble_4bits

)

This routine decode a 4-bit nibble sample to a uint16 PCM audio sample.

Parameters

nibble_4bits

A 4-bit nibble to decode

Returns

The decoded value as a 16-bit PCM sample

Codec1_encodeBuff()

uint8_t Codec1_encodeBuff	(	uint8_t *	dst,
		int16_t *	src,
		int16_t	srcSize,
		int8_t *	si,
		int16_t *	pv
	)

This routine encode a buffer with TI codec Type 1.

Parameters

dst	Pointer to the buffer where encoding result will be written to
src	Pointer to the buffer that should be encoded. Must be a multiple of 4 bytes
srcSize	The number of samples (int16) in the src buffer. Must be a multiple of 2.
si	Pointer to the current step index
pv	Pointer to the current predicted-value

Returns

Number of bytes written to the destination buffer

Codec1_decodeBuff()

void Codec1_decodeBuff	(	int16_t *	dst,
		uint8_t *	src,
		unsigned	srcSize,
		int8_t *	si,
		int16_t *	pv
	)

This routine decodes a buffer with TI codec Type 1.

Parameters

dst	Pointer to the buffer where decoded result will be written to
src	Pointer to the buffer that should be decoded. Must be a multiple of 4 bytes
srcSize	Number of byte that will be generated by the encoder (4* (src buffer size in byte))
si	Pointer to the current step index
pv	Pointer to the current predicted-value