adpcm.c 文件参考

#include <stdint.h>
#include "adpcm.h"
#include "ci130x_system.h"
#include "romlib_runtime.h"

宏定义
#define	USE_MASK_ROM_PCM_TABLE_DATA   1

函数
uint8_t	ADPCM_Encode (int32_t sample)
	ADPCM_Encode. 更多...
int16_t	ADPCM_Decode (uint8_t code)
	ADPCM_Decode. 更多...
int32_t	ADPCM_Decode_clear (void)
void	set_adpcm_decode_index (int16_t decode_index)
void	set_adpcm_decode_predsample (int32_t decode_predsample)

变量
uint16_t const *	StepSizeTable = (uint16_t const*)(MASK_ROM_PCM_TABLE_ADDR)
const int8_t	IndexTable [16] = {0xff, 0xff, 0xff, 0xff, 2, 4, 6, 8, 0xff, 0xff, 0xff, 0xff, 2, 4, 6, 8}
static int16_t	Encodeindex = 0
static int32_t	Encodepredsample = 0
static int16_t	Decodeindex = 0
static int32_t	Decodepredsample = 0

宏定义说明

USE_MASK_ROM_PCM_TABLE_DATA

#define USE_MASK_ROM_PCM_TABLE_DATA   1

函数说明

ADPCM_Decode()

int16_t ADPCM_Decode

(

uint8_t

code

)

ADPCM_Decode.

参数

code	a byte containing a 4-bit ADPCM sample.

返回值

16-bit ADPCM sample

ADPCM_Decode_clear()

int32_t ADPCM_Decode_clear

(

void

)

ADPCM_Encode()

uint8_t ADPCM_Encode

(

int32_t

sample

)

ADPCM_Encode.

参数

sample

a 16-bit PCM sample

返回值

a 4-bit ADPCM sample

set_adpcm_decode_index()

void set_adpcm_decode_index

(

int16_t

decode_index

)

set_adpcm_decode_predsample()

void set_adpcm_decode_predsample

(

int32_t

decode_predsample

)

变量说明

Decodeindex

int16_t Decodeindex = 0

static

Decodepredsample

int32_t Decodepredsample = 0

static

Encodeindex

int16_t Encodeindex = 0

static

Encodepredsample

int32_t Encodepredsample = 0

static

IndexTable

const int8_t IndexTable[16] = {0xff, 0xff, 0xff, 0xff, 2, 4, 6, 8, 0xff, 0xff, 0xff, 0xff, 2, 4, 6, 8}

StepSizeTable

uint16_t const* StepSizeTable = (uint16_t const*)(MASK_ROM_PCM_TABLE_ADDR)