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Data Structures | Macros | Functions
adx.h File Reference

SEGA CRI adx codecs. More...

#include <stdint.h>
#include "avcodec.h"

Go to the source code of this file.

Data Structures

struct  ADXChannelState
struct  ADXContext


#define COEFF_BITS   12
#define BLOCK_SIZE   18
#define BLOCK_SAMPLES   32


void ff_adx_calculate_coeffs (int cutoff, int sample_rate, int bits, int *coeff)
 Calculate LPC coefficients based on cutoff frequency and sample rate. More...
int ff_adx_decode_header (AVCodecContext *avctx, const uint8_t *buf, int bufsize, int *header_size, int *coeff)
 Decode ADX stream header. More...

Detailed Description

SEGA CRI adx codecs.

Reference documents: http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/

Definition in file adx.h.

Macro Definition Documentation

#define COEFF_BITS   12

Definition at line 51 of file adx.h.

Referenced by adx_decode(), adx_encode(), adx_encode_init(), and ff_adx_decode_header().

#define BLOCK_SIZE   18
#define BLOCK_SAMPLES   32

Definition at line 54 of file adx.h.

Referenced by adx_encode_init(), adx_parse(), and ff_adx_decode_header().

Function Documentation

void ff_adx_calculate_coeffs ( int  cutoff,
int  sample_rate,
int  bits,
int *  coeff 

Calculate LPC coefficients based on cutoff frequency and sample rate.

cutoffcutoff frequency
sample_ratesample rate
bitsnumber of bits used to quantize coefficients
[out]coeff2 quantized LPC coefficients

Definition at line 26 of file adx.c.

Referenced by adx_encode_init(), and ff_adx_decode_header().

int ff_adx_decode_header ( AVCodecContext avctx,
const uint8_t buf,
int  bufsize,
int *  header_size,
int *  coeff 

Decode ADX stream header.

Sets avctx->channels and avctx->sample_rate.

avctxcodec context
bufheader data
bufsizedata size, should be at least 24 bytes
[out]header_sizesize of ADX header
[out]coeff2 LPC coefficients, can be NULL
data offset or negative error code if header is invalid

Definition at line 38 of file adx.c.

Referenced by adx_decode_frame(), and adx_decode_init().