adx.h File Reference

SEGA CRI adx codecs. More...

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

Go to the source code of this file.

Classes
struct	ADXChannelState
struct	ADXContext

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

Typedefs
typedef struct ADXChannelState	ADXChannelState
typedef struct ADXContext	ADXContext

Functions
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/

Function Documentation

ff_adx_calculate_coeffs()

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

Calculate LPC coefficients based on cutoff frequency and sample rate.

Parameters

	cutoff	cutoff frequency
	sample_rate	sample rate
	bits	number of bits used to quantize coefficients
[out]	coeff	2 quantized LPC coefficients

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.

Parameters

	avctx	codec context
	buf	header data
	bufsize	data size, should be at least 24 bytes
[out]	header_size	size of ADX header
[out]	coeff	2 LPC coefficients, can be NULL

Returns

data offset or negative error code if header is invalid